Sulfation of endothelial mucin by corneal keratan N-acetylglucosamine 6-O-sulfotransferase (GST-4beta).

Abstract:

:Intestinal N-acetylglucosamine 6-O-sulfotransferase (I-GlcNAc6ST, GST-4alpha) and corneal N-acetylglucosamine 6-O-sulfotransferases (C-GlcNAc6ST, GST-4beta) are two highly homologous GlcNAc 6-O-sulfotransferase isozymes encoded by two intronless open reading frames that reside approximately 50 kb apart on human chromosome 16q23.1. I-GlcNAc6ST has been shown to catalyze 6-O-sulfation of the endothelial mucin GlyCAM-1. C-GlcNAc6ST catalyzes 6-O-sulfation of GlcNAc in keratan sulfate and null-mutations in its encoding gene cause human macular corneal dystrophy. We show here that C-GlcNAc6ST efficiently catalyzes sulfation of GlyCAM-1 when coexpressed with the latter in COS-7 cells. We have further compared expression in human of both enzymes by Northern analysis with isozyme-specific probes. While I-GlcNAc6T is expressed mostly in intestinal tissue, larger C-GlcNAc6ST transcripts are found predominantly in the brain.

authors

Bartes A,Bhakta S,Hemmerich S

doi

10.1006/bbrc.2001.4668

subject

Has Abstract

pub_date

2001-04-13 00:00:00

pages

928-33

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(01)94668-6

journal_volume

282

pub_type

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